Wondering if anyone has any experience or advice in this matter. I'm a little weary to try in case something happens to my Aperture library but I think this is ok to do. I have a MBP and a MBA. My Aperture library is located on an external HD, Mac formatted. I'd like to access the same library from both of these machines (not at the same time obviously). I use the MBP for the most part when at home or at the office and the MBA is the one I travel with. Is is it a safe practice to do this? Both the MBP & MBA have the latest versions of Mountain Lion and Aperture. Thanks for any advice!